FORT LAUDERDALE, Fla. — Authorities in South Florida say a man is charged with murder because he was overheard discussing the killing when his cellphone pocket-dialed 911.

The Broward Sheriff’s Office says 24-year-old Scott Simon is charged with first-degree murder in the May 5 shooting of 33-year-old Nicholas Walker. Walker was shot while driving his car onto an Interstate 95 on-ramp.

Authorities say Simon is heard on the 911 call telling someone he’s going to follow the victim home and kill him. But investigators say they believe Simon coordinated the killing and did not pull the trigger himself.

The shooting happened after Walker got into an argument with other men at a Waffle House restaurant. Authorities are still looking for two other suspects.